Marshall Wace LLP Buys Logitech International SA, Bank of America Corporation, Qiagen NV, Sells Alphabet Inc, Zoetis Inc, Amazon.com Inc

• New Purchases: LOGI, QGEN, WUBA, USFD, SAGE, OXY, XBI, BAX, ADP, APC,
• Added Positions: BAC, FB, BABA, CPN, AET, JPM, ALK, CHTR, CFG, A,
• Reduced Positions: GOOGL, ZTS, AMZN, MU, BA, GRFS, ETFC, GS, SHPG, NXPI,
• Sold Out: FXI, ALR, RICE, VWR, BIDU, AXP, MO, ALL, RYAAY, TSN,

For the details of Marshall Wace LLP's stock buys and sells, go to http://www.gurufocus.com/StockBuy.php?GuruName=Marshall+Wace+LLP

1. Alphabet Inc (GOOGL) - 83,960 shares, 3.72% of the total portfolio. Shares reduced by 48.52%
2. Zoetis Inc (ZTS) - 1,210,135 shares, 3.66% of the total portfolio. Shares reduced by 46.35%
3. Logitech International SA (LOGI) - 2,215,424 shares, 3.14% of the total portfolio. New Position
4. Facebook Inc (FB) - 414,034 shares, 3.07% of the total portfolio. Shares added by 65.41%
5. British American Tobacco PLC (BTI) - 918,231 shares, 2.59% of the total portfolio. Shares added by 3.35%

Marshall Wace LLP initiated holding in Logitech International SA. The purchase prices were between $32.85 and $37.15, with an estimated average price of $35.02. The stock is now traded at around $36.63. The impact to a portfolio due to this purchase was 3.14%. The holding were 2,215,424 shares as of 2017-12-31.

Marshall Wace LLP initiated holding in Qiagen NV. The purchase prices were between $30.68 and $35.37, with an estimated average price of $32.51. The stock is now traded at around $32.29. The impact to a portfolio due to this purchase was 1.92%. The holding were 1,450,407 shares as of 2017-12-31.

Marshall Wace LLP initiated holding in 58.com Inc. The purchase prices were between $62.53 and $79.2, with an estimated average price of $69.22. The stock is now traded at around $79.66. The impact to a portfolio due to this purchase was 1.84%. The holding were 613,107 shares as of 2017-12-31.

Marshall Wace LLP initiated holding in US Foods Holding Corp. The purchase prices were between $26.04 and $31.93, with an estimated average price of $28.31. The stock is now traded at around $33.00. The impact to a portfolio due to this purchase was 0.96%. The holding were 712,456 shares as of 2017-12-31.

Marshall Wace LLP initiated holding in Sage Therapeutics Inc. The purchase prices were between $60.72 and $167.34, with an estimated average price of $97.03. The stock is now traded at around $161.61. The impact to a portfolio due to this purchase was 0.93%. The holding were 134,788 shares as of 2017-12-31.

Marshall Wace LLP initiated holding in Occidental Petroleum Corp. The purchase prices were between $63.91 and $73.7, with an estimated average price of $67.83. The stock is now traded at around $65.02. The impact to a portfolio due to this purchase was 0.79%. The holding were 254,372 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in Bank of America Corporation by 691.10%. The purchase prices were between $25.45 and $29.88, with an estimated average price of $27.56. The stock is now traded at around $29.64. The impact to a portfolio due to this purchase was 1.97%. The holding were 1,816,510 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in Facebook Inc by 65.41%. The purchase prices were between $168.42 and $183.03, with an estimated average price of $176.73. The stock is now traded at around $159.50. The impact to a portfolio due to this purchase was 1.21%. The holding were 414,034 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in Alibaba Group Holding Ltd by 406.34%. The purchase prices were between $168.96 and $191.19, with an estimated average price of $179.21. The stock is now traded at around $181.78. The impact to a portfolio due to this purchase was 1.08%. The holding were 186,218 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in Calpine Corp by 382.51%. The purchase prices were between $14.67 and $15.14, with an estimated average price of $14.98. The stock is now traded at around $15.25. The impact to a portfolio due to this purchase was 1.05%. The holding were 2,096,567 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in Aetna Inc by 680.98%. The purchase prices were between $151.44 and $182.73, with an estimated average price of $171.68. The stock is now traded at around $169.10. The impact to a portfolio due to this purchase was 0.94%. The holding were 142,786 shares as of 2017-12-31.

Marshall Wace LLP added to a holding in JPMorgan Chase & Co by 848.52%. The purchase prices were between $95.86 and $107.83, with an estimated average price of $101.2. The stock is now traded at around $108.79. The impact to a portfolio due to this purchase was 0.8%. The holding were 198,857 shares as of 2017-12-31.

Marshall Wace LLP sold out a holding in iShares China Large-Cap. The sale prices were between $44.18 and $48.32, with an estimated average price of $46.19.

Marshall Wace LLP sold out a holding in Alere Inc. The sale prices were between $50.99 and $50.99, with an estimated average price of $50.99.

Marshall Wace LLP sold out a holding in Rice Energy Inc. The sale prices were between $26.29 and $29.66, with an estimated average price of $28.12.

Marshall Wace LLP sold out a holding in VWR Corp. The sale prices were between $33.06 and $33.25, with an estimated average price of $33.15.

Marshall Wace LLP sold out a holding in Baidu Inc. The sale prices were between $229.66 and $272.82, with an estimated average price of $244.63.

Marshall Wace LLP sold out a holding in American Express Co. The sale prices were between $90.54 and $99.7, with an estimated average price of $95.2.